Zg boiler dhx type circulating fluidized bed boiler is an improved product based on the advantages of the circulating fluidized bed boilers at home and abroad. By reducing the circulation ratio and optimizing the key components and parts, the problems including boiler abrasion, the coking and blocking in the feedback section, high original discharged dust consistence and difficult slag discharge have been overcome. All the features make the boiler structure is more rational, performance is more excellent and the operation is more secure. Fumigated wood box, u-steel, steel frame reach to sea transportation requirement.